MATLAB: By default one radio button is selected in button group but i want in initial no radio button is selected with Buttongroup

button groupMATLAB

Button group

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That does not appear to be possible in R2014b or later. It appears to me that the first button added to a uibuttongroup automatically has its Value set to 1.

Your options are:

set() the Value of the first button to 0 after it is added to the uibuttongroup; or
create a junk button first and add it to the uibuttongroup, and then after the other buttons are added, delete the junk button.

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MATLAB: Store value of selected radio button from group button

u = get(get(handles.uipanel12,'SelectedObject'), 'Value');

MATLAB: ButtonGroup

The lines I changed are marked with a %%

   function [] = test(varargin)
   N.fh=figure('units','pixels',...
      'position',[500 250 300 400],...
      'color',[0.73 0.83 0.96],...
      'menubar','none',...
      'name','Title',...
      'numbertitle','off',...
      'resize','off');
   N.bg = uibuttongroup('unit','pix',...
      'position',[15 25 270 55],...
      'title','Back Ground Color',...
      'fontsize',9,...
      'backgroundcolor',[0.73 0.83 0.96],...
      'foregroundcolor',[0.08 0.17 0.55]);
   N.blue = uicontrol(N.bg,...
      'style','rad',...
      'unit','pix',...
      'position',[15 15 50 15],...
      'string','Blue',...
      'value',1,...
      'backgroundcolor',[0.73 0.83 0.96]);
   N.green = uicontrol(N.bg,...
      'style','rad',...
      'unit','pix',...
      'position',[110 15 50 15],...
      'string','Green',...
      'value',0,...
      'backgroundcolor',[0.73 0.83 0.96]);
   N.gray = uicontrol(N.bg,...
      'style','rad',...
      'unit','pix',...
      'position',[200 15 50 15],...
      'string','Gray',...
      'value',0,...
      'backgroundcolor',[0.73 0.83 0.96]);
   set([N.blue,N.green,N.gray],'callback',{@bg_call,N})  %%1
   function [] = bg_call(varargin)
   N = varargin{3};
   switch findobj(get(N.bg,'SelectedObject'))            %%2
      case N.blue
     set(N.fh,'color',[0.73 0.83 0.96]);                 %%3


      case N.green
     set(N.fh,'color',[0.6 1 0.6]);                      %%3
      case N.gray
     set(N.fh,'color',[0.8 0.8 0.8]);                    %%3
   end

For %%1, you forgot the word 'callback' and you were trying to assign the callback to the buttongroup itself, not the buttons. The alternative would be to use the selectionchangefcn of the buttongroup.
For %%2, you used the field data2, but never assigned a field data2. Also, you do not need to use FINDOBJ here, you could replace this with varargin{1}.
For %%3, you referenced N.figure, but there was no field with this name in N. You meant N.fh.

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MATLAB: Store value of selected radio button from group button

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